J/A+A/474/891 13CO observations of YSOs in South Gal. plane (Urquhart+, 2007)
The RMS survey. 13CO observations of candidate massive YSOs in the southern Galactic plane. Urquhart J.S., Busfield A.L., Hoare M.G., Lumsden S.L., Oudmaijer R.D., Moore T.J.T., Gibb A.G., Purcell C.R., Burton M.G., Marechal L.J.L. <Astron. Astrophys., 474, 891-901 (2007)> =2007A&A...474..891U
ADC_Keywords: YSOs ; Stars, pre-main sequence ; Radio lines Keywords: stars: formation - stars: early-type - stars: pre-main sequence - ISM: clouds - ISM: kinematics and dynamics Abstract: The Red MSX Source (RMS) survey is an ongoing multi-wavelength observational programme designed to return a large, well-selected sample of massive young stellar objects (MYSOs). We have identified ∼2000 MYSOs candidates located within our Galaxy by comparing the colours of MSX and 2MASS point sources to those of known MYSOs. The aim of our follow-up observations is to identify other contaminating objects such as ultra compact (UC) HII regions, evolved stars and planetary nebulae (PNe) and distinguish between genuine MYSOs and nearby low-mass YSOs. A critical part of our follow-up programme is to conduct 13CO molecular line observations in order to determine kinematic distances to all of our MYSO candidates. These distances will be used in combination with far-IR and (sub)millimetre fluxes to determine bolometric luminosities which will allow us to identify and remove nearby low-mass YSOs. In addition these molecular line observations will help in identifying evolved stars which are weak CO emitters. We have used the 22m Mopra telescope, the 15m JCMT and the 20m Onsala telescope to conduct molecular line observations towards 854 MYSOs candidates located in the 3rd and 4th quadrants. These observations have been made at the J=1-0 (Mopra and Onsala) and J=2-1 (JCMT) rotational transition frequency of 13CO molecules and have a spatial resolution of ∼20"-40", a sensitivity of TA*∼0.1K and a velocity resolution of ∼0.2km/s. Description: MSX names, positions, observational rms values and molecular line parameters obtained from Gaussian fits to all detected components made towards the RMS sample of massive young stellar object candidates located in the southern Galactic plane. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 156 2132 *Summary of the RMS sources observed, observed positions, the rms noise levels of the reduced spectra, line component parameters and Galactic kinematic distances. sp/* 0 1504 Spectra in FITS and PNG
Note on table3.dat: The line parameters have been obtained from Gaussian fits to the data and the distances have been calculated using the Galactic rotation curves of Brand and Blitz 1993, Cat. J/A+A/275/67.
See also: J/A+A/461/11 : Radio observations of MYSO candidates (Urquhart+, 2007) Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 17 A17 --- MSX Field name (GLLL.llll+DD.dddd) 19- 26 F8.4 deg RAdeg Right ascension (J2000) 28- 35 F8.4 deg DEdeg Declination (J2000) 37 A1 --- Tel [JOM] Telescope symbol (J)CMT, (O)nsala and (M)opra 39- 43 F5.3 K rms Spectra rms in units of TA* 45- 46 I2 --- Comp ?=- Component number 48 I1 --- Match ? Flag to identify line component associated with RMS source 1=association, blank=unassociated 50- 55 F6.1 km/s VLSR ?=- Kinematic velocity 57- 60 F4.1 K TR ?=- Receiver temperature 62- 65 F4.1 km/s FWHM ?=- Line full width at half maximum 67- 71 F5.1 km/s.K TRdV ?=- Integrated emission 73- 98 A26 --- Profile ?=- Note on component profile 100-103 F4.1 kpc RGC ?=- Galactocentric distance of component 105-108 F4.1 kpc Near ?=- Near distance 110-113 F4.2 kpc e_Near ?=- Error in the near distance 115-118 F4.1 kpc Far ?=- Far distance 120-123 F4.2 kpc e_Far ?=- Error in the far distance 125-129 A5 --- Notes Notes on the method used to identify the component associated with an RMS source (1) 131-156 A26 --- Radix Filename radix with the spectrum (2)
Note (1): Methods as follows: 1 = strongest component 2 = methanol maser 3 = water maser 4 = CS detection by Bronfman et al., 1996, Cat. J/A+AS/115/81 5 = Fontani et al., 2005, Cat. J/A+A/432/921 Note (2): only the file radix is given in this column; the extension ".fits" should be added for the FITS version, or ".png" for the image. The files are in the "sp" subdirectory.
Acknowledgements: James Urquhart, jsu(at)ast.leeds.ac.uk
(End) Patricia Vannier [CDS] 20-Dec-2007
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